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Date and Time of the Query: 2019-07-15 T22:58:57 PDT
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For refcode 2000ApJ...533..682C:
Retrieve 8 NED objects in this reference.
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2000ApJ...533..682C The Dust Content and Opacity of Actively Star-forming Galaxies1 Daniela Calzetti Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; calzetti@stsci.edu Lee Armus SIRTF Science Center/Caltech, Pasadena, CA 91125; lee@ipac.caltech.edu Ralph C. Bohlin and Anne L. Kinney Space Telescope Science Institute, MD 21218; bohlin@stsci.edu; kinney@stsci.edu Jan Koornneef Kapteyn Astronomical Institute, University of Groningen, Groningen, 9700 AV, Netherlands; J.Koornneef@astro.rug.nl and Thaisa Storchi-Bergmann Instituto de Fisica, Universidade Federal Rio Grande do Sul, Porto Alegre, RS 91501-970, Brazil; thaisa@if.ufrgs.br Received 1999 July 19; accepted 1999 November 30 ABSTRACT We present far-infrared (FIR) photometry at 150 and 205 microns of eight low-redshift starburst galaxies obtained with the Infrared Space Observatory (ISO) ISOPHOT. Five of the eight galaxies are detected in both wave bands, and these data are used, in conjunction with IRAS archival photometry, to model the dust emission at {lambda} > 40 microns. The FIR spectral energy distributions (SEDs) are best fitted by a combination of two modified Planck functions, with T ~ 40-55 K (warm dust) and T ~ 20-23 K (cool dust) and with a dust emissivity index {epsilon} = 2. The cool dust can be a major contributor to the FIR emission of starburst galaxies, representing up to 60% of the total flux. This component is heated not only by the general interstellar radiation field, but also by the starburst itself. The cool dust mass is up to ~150 times larger than the warm dust mass, bringing the gas-to-dust ratios of the starbursts in our sample close to Milky Way values, once rescaled for the appropriate metallicity. The ratio between the total dust FIR emission in the range 1-1000 {mu}m and the IRAS FIR emission in the range 40-120 {mu}m is ~1.75, with small variations from galaxy to galaxy. This ratio is about 40% larger than previously inferred from data at millimeter wavelengths. Although the galaxies in our sample are generally classified as "UV bright," for four of them the UV energy emerging shortward of 0.2 {mu}m is less than 15% of the FIR energy. On average, about 30% of the bolometric flux is coming out in the UV-to- near-IR wavelength range; the rest is emitted in the FIR. Energy balance calculations show that the FIR emission predicted by the dust reddening of the UV-to-near-IR stellar emission is within a factor of ~2 of the observed value in individual galaxies and within 20% when averaged over a large sample. If our sample of local starbursts is representative of high- redshift (z > 1), UV-bright, star-forming galaxies, these galaxies' FIR emission will be generally undetected in submillimeter surveys, unless (1) their bolometric luminosity is comparable to or larger than that of ultraluminous FIR galaxies and (2) their FIR SED contains a cool dust component. Subject headings: galaxies: starburst-infrared: galaxies-infrared: ISM: continuum-ISM: dust, extinction
Retrieve 8 NED objects in this reference.
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